单组分多相系统驱替过程的格子Boltzmann模拟

SINGLE COMPONENT MULTIPHASE DISPLACEMENT WITH LATTICE BOLTZMANN MODELS

结合格子Boltzmann方法中的Shan-Chen单组分多相模型,引入流体相间的内聚力和流体与固体壁面间的黏附力,对二维孔隙网格中非浸润气相驱替完全浸润液相的过程进行模拟,流体相间的交界面自然形成,整个驱替过程属于毛细指进.随着毛细数的增加,黏性力的主导作用增强,使得气相入侵的孔隙尺度减小,因此驱替形态随毛细数的不同有很大差别.在微重力的作用下,整个驱替过程受毛细力、重力和黏性力的共同作用,重力起到了稳定交界面避免窜流的作用.

By introducing fluid-fluid and fluid-solid surfaces interactions, the process of the non-wetting vapor phase displacing complete-wetting liquid phase in two-dimensional pore-networks is simulated based on the Shan- Chen single component multiphase model of lattice Boltzmann method. The fluid interfaces form naturally and the displacement is of capillary fingering. With the capillary number increasing, the viscous force becomes more and more dominating and the sizes of the pores invaded by vapor decrease, leading to rich behaviors of the displacement. With the imposition of the gravity, the gravity plays a stabilizing role on the vapor invasion front.